It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 3 996 749 is not a prime number.
For example, 3 996 749 can be divided by 157: 3 996 749 / 157 = 25 457.
For 3 996 749 to be a prime number, it would have been required that 3 996 749 has only two divisors, i.e., itself and 1.
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3 996 749 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 3 996 749 is about 1 999.187.
Thus, the square root of 3 996 749 is not an integer, and therefore 3 996 749 is not a square number.
The square of a number (here 3 996 749) is the result of the product of this number (3 996 749) by itself (i.e., 3 996 749 × 3 996 749); the square of 3 996 749 is sometimes called "raising 3 996 749 to the power 2", or "3 996 749 squared".
The square of 3 996 749 is 15 974 002 569 001 because 3 996 749 × 3 996 749 = 3 996 7492 = 15 974 002 569 001.
As a consequence, 3 996 749 is the square root of 15 974 002 569 001.
The multiples of 3 996 749 are all integers evenly divisible by 3 996 749, that is all numbers such that the remainder of the division by 3 996 749 is zero. There are infinitely many multiples of 3 996 749. The smallest multiples of 3 996 749 are: